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Income Taxes - Reconciliation Of Calculated Income Tax Expense Based on the Statutory Rate to Actual Amount of Taxes Recorded (Parenthetical) (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2023 KRW (₩)
Disclosure of Income Taxes [Line Items]
Loss eligible to be carried forward upon disposal of joint venture	₩ 122,922

X

- Definition

Line items represent concepts included in income taxes.

+ References

No definition available.

+ Details

Name:	pkx_DisclosureOfIncomeTaxesLineItems
Namespace Prefix:	pkx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loss eligible to be carried forward upon disposal of joint venture.

+ References

No definition available.

+ Details

Name:	pkx_LossEligibleToBeCarriedForwardUponDisposalOfJointVenture
Namespace Prefix:	pkx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration